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Lamisil Precautions and Warnings

An awareness of Lamisil precautions and warnings before taking the drug can ensure a safe treatment process. You should not take Lamisil if you are allergic to Lamisil, terbinafine hydrochloride, or any inactive component used to make the medicine. Lamisil precautions and warnings also extend to potential side effects, including liver failure, lupus, changes in vision, or low blood counts.

Lamisil: What Should I Tell My Healthcare Provider?

You should talk with your healthcare provider prior to taking Lamisil® (terbinafine hydrochloride) if you have:
  • Liver disease, including cirrhosis
  • Kidney disease or kidney failure
  • A poorly functioning immune system (such as with HIV or cancer)
  • Systemic lupus erythematosus (SLE or lupus for short)
  • Any allergies, including allergies to foods, dyes, or preservatives.
Also let your healthcare provider know if you:
  • Are pregnant or thinking of becoming pregnant
  • Are breastfeeding.
It's important to also tell your healthcare provider about all other medicines you may be taking, including prescription and non-prescription medicines, vitamins, and herbal supplements.

Specific Lamisil Precautions and Warnings

Warnings and precautions to be aware of prior to taking Lamisil include the following:
  • Lamisil can interact with certain medications (see Lamisil Drug Interactions).
  • Lamisil is considered a pregnancy Category B medication. This means that Lamisil is probably safe for use during pregnancy. However, using the drug during pregnancy is not recommended, since the full risks are not known and the treatment of nail fungus can be postponed until after pregnancy. Be sure to discuss the possible risks with your healthcare provider before using Lamisil during pregnancy.
  • Lamisil is passed through breast milk. Therefore, if you are breastfeeding or plan to start breastfeeding and are taking Lamisil, talk with your healthcare provider about this. He or she can decide whether taking Lamisil while nursing would be OK for your particular situation.
  • There have been rare cases of Lamisil causing liver failure. Some of these people required a liver transplantation or died as a result. This is more likely to happen in people with existing liver disease. Your healthcare provider should check your liver function (using blood tests) before you start using Lamisil. Also, you should tell your healthcare provider right away if you have any possible symptoms of liver problems, including:
    • Yellow eyes or skin
    • Dark urine
    • Vomiting
    • Itching
    • Pain in the upper-right abdomen.
  • Lamisil can cause life-threatening skin rashes (known medically as Stevens-Johnson syndrome). Call your healthcare provider right away if you experience an unexplained rash that does not go away, especially if the rash involves blisters or peeling of the skin. Also let your healthcare provider if you have other signs of an allergic reaction, including itching, wheezing, or difficulty breathing or swallowing.


  • Lamisil can cause a loss of taste or smell, or other changes in tasting or smelling. This can be a disturbing problem that may go away or may become permanent. If these side effects occur, let your healthcare provider know. You will probably need to stop taking Lamisil.


  • Lamisil has not been studied in patients with poorly functioning kidneys. Therefore, if you have kidney problems, discuss this with your healthcare provider before starting Lamisil.
  • There have been reports of Lamisil causing lupus or making it worse. Lupus is a condition involving skin rashes (typically a "butterfly" rash on the face) and other serious problems. If you develop symptoms of lupus, or if your lupus gets worse, while taking Lamisil, you should stop taking the medication and call your healthcare provider.
  • In rare cases, Lamisil has caused changes in vision. Let your healthcare provider know if you have any vision changes, including blurred or double vision.
  • If your immune system is not functioning well (such as in people with HIV/AIDS, cancer, or other conditions) and you have taken Lamisil for longer than six weeks, you should have blood tests done to make sure your blood counts are not decreasing too much.
  • Lamisil can cause certain blood cell counts to decrease, putting you at risk for infection. If you have an unusual infection (or if you have more infections than normal), talk to your healthcare provider about the possibility of low blood cell counts.

Lamisil Medication

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